3rd & 4th Generation (1992–1996 & 1997–2001)Toyota Camry Discussion for years: 1992-1996 & 1997-2001
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95 Camry 1MZ-FE with 225,000 miles: Failed emission test. CO:1.17 for 1.10 limit, HC: 480 for 275 limit, NO: 3858 for 3600 with RPM 1688, Dilution 14.7%. Changed air filter, spark plugs, engine oil/filter, and deep cleaned fuel injector before the test. It runs good although it might have lost some power gradually these years. Are there any specific order to test emission related devices based on these readings? How can I test each devices? If Catalytic converter need to be replaced, which brand/model is the best for cost/performance? Where can I buy it? Thanks.
Last edited by toyodajidosha; 09-12-2009 at 01:12 AM.
Reason: Additional info
If you failed the emissions test, it's most likely that the catalytic converter has met its end, especially if it's never been changed and you're over 200K. Since the CEL didn't come on, it's less likely that the problem is with the other components.
As for what brand/model for price/performance, I remember reading magnaflow is the better brand and not sure which model.
High NOx often indicates lean burn. But high HC and CO can mean rich mixture.
Assuming the engine is properly tuned (timing belt, valve clearances as well), then I would suspect the oxygen sensors and carbon build up in the cylinder.
Maybe Sea Foam it and change out the sensors? Do you have free re-test?
Quote:
Originally Posted by toyodajidosha
95 Camry 1MZ-FE with 225,000 miles: Failed emission test. CO:1.17 for 1.10 limit, HC: 480 for 275 limit, NO: 3858 for 3600 with RPM 1688, Dilution 14.7%. Changed air filter, spark plugs, engine oil/filter, and deep cleaned fuel injector before the test. It runs good although it might have lost some power gradually these years. Are there any specific order to test emission related devices based on these readings? How can I test each devices? If Catalytic converter need to be replaced, which brand/model is the best for cost/performance? Where can I buy it? Thanks.
High NOx often indicates lean burn. But high HC and CO can mean rich mixture.
Assuming the engine is properly tuned (timing belt, valve clearances as well), then I would suspect the oxygen sensors and carbon build up in the cylinder.
Maybe Sea Foam it and change out the sensors? Do you have free re-test?
I'm not sure if my mechnic performed Sea Forming or not. They wrote on the work order as "Performed top end engine cleaner service".
Posted readings were from the second test which the numbers were pretty much same as those from the first tail pipe emission test.
If you failed the emissions test, it's most likely that the catalytic converter has met its end, especially if it's never been changed and you're over 200K. Since the CEL didn't come on, it's less likely that the problem is with the other components.
As for what brand/model for price/performance, I remember reading magnaflow is the better brand and not sure which model.
Do those sensors' failure give any warnings? If so and there were no Check Engine sign, the cause most likely to be the catalytic converter?
Update:
I took the Camry to the mechanic who performed top end engine cleaning earlier. This time he made adjustment to air fuel system by manipulating the on board computer and passed the emission. He didn't look for the cause of the emission test failure but focused on bringing down the emission values to pass the test. Actually, I wanted to know the cause of it. I'll post if there is any discovery of the cause.
In addition I've found misplaced my Camry repair record folder in my house and learned that Catalytic converter was replaced in 2007 when the flex Exhaust pipe needed to be replaced, and Bank 1 Oxygen sensor were replaced in 2006 after Check Engine Light came on.
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95 V6 Camry Emission Test Failed
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